Well, I don't care. If tonight's run is anything to go by, it's true. I thought I'd nip out for a Buzzard Loop, before it chucked it down with rain. The last thing I agreed with Mrs HF as I went out the door was 'I'm just going to take it easy' (so no need for a watch), but as soon as I took my first stride I felt good. So I pushed up the hills, felt strong on the descents and enjoyed the flat bits. Net result: I felt faster than I have in ages. But was I? I'll never know.
Still, it's raining now. So that bit of the plan went right!